Improvement in packer, for packing- sand in moulders  flasks



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BENJAMIN s. BENSON, 0E BALTIMORE, MARYLAND..

4Laim Patent No. 88,029, daad october 18, 1868.

IMPRQVEMENT IN PACKER, FOR PACKING-,SAND IN MOULDERS ELASKS.

The Schedule referred ta in these Letters Patent and making part of the same. y

To all whom it may concern:

Be it known that I, BENJAMnr S. BENSON, of the city of Baltimore, in the county `of4 Baltimore, and State of Maryland, have invented certain new and useful Improvements in Packers for Packing Flasks, 85o., for moulding pipes and other articles; and I do hereby declare the following to be a`full, clear, and exact description of the same, reference being. had to the accompanying drawings, making a part of this specification, in Whichv Figure -1 represents an elevation from one side of the packer;

Figure 2A represents an elevation from the opposite side thereof; and

Figure 3 represents a vertical section. through the packer.

Similar letters, where they occur, refer to like parts I in all of the igures.

In the use of packers for packing sand in flasks or moulds, I have found great diiiiculty, from the choking of the packer bythe damp sand under the front portion of the screw, the sand lying so loose that it sticks under the after-part of the packer, and, as it becomes more hard, will rub oli" the adhering particles.-

In my attempts to obviate this diculty, I have used a zinc fillet, the whole length of the screw, to round up the sharp corners, which metal, from'its nature, together with the rounding up of the corners, prevented the sticking of the -sand thereto, but left a soft place in the mould at the junction of each layer of sand. The extending of the fillet to the end of the screwthread, caused the sand to be rounded up, and the sand of the next round or layer would not be packed in the sharp corner produced by the llet. I then removed most of the filletv on the' last end of the screw, and increased it on the rst end of the thread of the screw, whichobviatedthe diicult'y of the choking by the other for'ms. I ascertained by my experiments and results that about two-thirds of the lengthy of the screw should be made of zinc, or other soft metal that sand would notadhere to, and Vthat ,the remaininglone-third of it was bestmade'of'fliardened steel; and that an increasing pitch in the screw from its first end would press the sand down lightly at first, and as it continued to revolve, and the pitch of the screw diminished, the sand was more. and more densely packed, and so much so as to prevent it from adhering to the screw as it turned, ,the iillet becoming less and less inclined, until it unites with the'steel portion, and the steel diminishing in pitch until it terminates square, or nearly so, with the axis of the shaft, and

makes a square bearing for the finall packing.

A nd the nature of my invention consists in a packen for packing sand in flasks, having a screw-thread on its perimeter, of diminishing pitch from its first end, and a illet, of zinc or other soft metal, or alloy of metals, under it, said screw-thread terminating in a steel or hardened-metal end that -is square, or nearly so, with the axis of the shaft or head on which it is placed.

To enable others skilled in the art to make and usev my invention, I will proceed to describe the same'with reference to the drawings.

A represents a mandrel or shaft, having upon it a screw-thread,' B, 'with a gradually-diminished pitch from its first end a to the last end b. Under this screw-thread is cast a fillet, c, of zinc, or other soft metal, or alloy of metal, that san'd will not adhereto as it does to iron or steel when the friction'is very great. This lillet c, instead of forming a, square or sharp corner under the screw-thread, is rounded oli', as shown in the drawings, but the round diminishes as the thread diminishes in its pitch, until the fillet terminates at c, where a steel or other hard-metal llet or section D is united withit; said last-named fillet D o1" section terminating "at d, and nearly square with the axis of the mandrel or shaft A.

'Io give the llet a firm support at and around the screw-thread, holes c may be made in the screw-thread for the molten metal to ilow into, or for bolts f,.or both; the steel portion being bolted on, so as to be removed when worn, and replaced by a new one.

Around the mandrel or shaft A, and below the illet, are sectional plates of steel, E, which are4 riveted or bolted onto the mandrel,as shown at g, so that they can be removed,'and replaced by others, when worn or cut byf'use.

. Having thusfully described my invention,

AVihat I claim therein as new, and desire to secure by Letters Patent, is-f The packing-instrument, with a screw-thread of gradually-diminishing pitch from its first end, and a zinc or other soft-metal or alloy-of-metal lillet under and around it, as and forthepurpose herein described and represented.

I also claim, in combination with the screw-thread and fillet, the sectional and removable' steel plates D and E, substantially as and for the purpose described.

BENJ. S. BENSON.

Witnesses:

A. B. SToUGnroN, J. E. EMERSON. 

